Towel rack



FIG. 1 is a front view of a towel rack embodying my new design;

FIG. 2 is a side view taken from the left of FIG. 1, the side opposite being a mirror image thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a bottom view thereof. 

The ornamental design for a towel rack, substantially as shown. 